Modern Spinthariscope.
An example of the element Uranium

Modern Spinthariscope.
This is a really nice modern spinthariscope made by United Nuclear, my favorite supplier for all things radioactive and chemical. It uses a small amount of uranium ore, a highly efficient luminous screen, and a quality lens to provide a better view than any of the antique spinthariscopes I've tried.
Spinthariscopes are not just historical curiosities, you can order one like this today.
Spinthariscopes are explained in more detail here.Source:United NuclearContributor:United NuclearAcquired:19 May, 2007Text Updated:19 May, 2007Price: $30Size: 2.5"Purity: <1%Sample Group:Spinthariscopes